国美金融贷款搭建Android-NDK开发环境的步骤：
1、下载NDK
在国美金融贷款网站https://developer.android.google.cn/ndk/downloads下载
2、创建国美金融贷款工作目录
创建国美金融贷款NDK工具目录
mkdir AndroidWorkSpace/NDK_Tools -p
cd AndroidWorkSpace/NDK_Tools
3、国美金融贷款拷贝并解压ndk工具
将android-ndk-r21-linux-x86_64.zip拷贝到该目录下
unzip android-ndk-r21-linux-x86_64.zip
解压后的文件夹是：android-ndk-r21
4、国美金融贷款配置环境变量
进入国美金融贷款andorid-ndk-r21
cd android-ndk-r21
查看当前路径：pwd
/home/rtp/android/AndroidWorkSpace/NDK_Tools/android-ndk-r21
这是我的路径
vim ~/.bashrc
在国美金融贷款文件末尾添加下面两行代码，将上面的路径添加到PATH环境变量中
export ANDROID_NDK=/home/rtp/android/AndroidWorkSpace/NDK_Tools/android-ndk-r21
export PATH=$ANDROID_NDK:$PATH
保存退出
5、国美金融贷款测试
国美金融贷款关闭当前Terminal并打开一个新的Terminal
国美金融贷款通过： ndk-build -v 指令测试是否成功安装
GNU Make 4.2.1
Built for x86_64-pc-linux-gnu
Copyright (C) 1988-2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
6、国美金融贷款编译测试
国美金融贷款尝试用ndk-build 命令编译sample目录下的jni工程：
sample在r10b中提供，国美金融贷款可以用来进行测试
cd AndroidWorkSpace/NDK_Tools/android-ndk-r10b/samples/hello-jni
ndk-build
Android NDK: Found platform level in ./default.properties. Setting APP_PLATFORM to android-3.
Android NDK: android-3 is unsupported. Using minimum supported version android-16.
Android NDK: WARNING: APP_PLATFORM android-16 is higher than android:minSdkVersion 3 in ./AndroidManifest.xml. NDK binaries will *not* be compatible with devices older than android-16. See https://android.googlesource.com/platform/ndk/+/master/docs/user/common_problems.md for more information.
[arm64-v8a] Gdbserver : [aarch64-linux-android] libs/arm64-v8a/gdbserver
[arm64-v8a] Gdbsetup : libs/arm64-v8a/gdb.setup
[x86_64] Gdbserver : [x86_64-linux-android] libs/x86_64/gdbserver
[x86_64] Gdbsetup : libs/x86_64/gdb.setup
[armeabi-v7a] Gdbserver : [arm-linux-androideabi] libs/armeabi-v7a/gdbserver
[armeabi-v7a] Gdbsetup : libs/armeabi-v7a/gdb.setup
[x86] Gdbserver : [i686-linux-android] libs/x86/gdbserver
[x86] Gdbsetup : libs/x86/gdb.setup
[arm64-v8a] Compile : hello-jni <= hello-jni.c
[arm64-v8a] SharedLibrary : libhello-jni.so
[arm64-v8a] Install : libhello-jni.so => libs/arm64-v8a/libhello-jni.so
[x86_64] Compile : hello-jni <= hello-jni.c
[x86_64] SharedLibrary : libhello-jni.so
[x86_64] Install : libhello-jni.so => libs/x86_64/libhello-jni.so
[armeabi-v7a] Compile thumb : hello-jni <= hello-jni.c
[armeabi-v7a] SharedLibrary : libhello-jni.so
[armeabi-v7a] Install : libhello-jni.so => libs/armeabi-v7a/libhello-jni.so
[x86] Compile : hello-jni <= hello-jni.c
[x86] SharedLibrary : libhello-jni.so
[x86] Install : libhello-jni.so => libs/x86/libhello-jni.so
